Answer :

A B = {x: x ϵ A or x ϵ B}


= {1, 2, 3, 4, 6, 8}


(AB)’ means Complement of (AB) with respect to universal set U.


So, (AB)’ = U – (AB)’


U – ( AB)’ is defined as {x ϵ U : x (AB)’}


U = {1, 2, 3, 4, 5, 6, 7, 8, 9}


(AB)’ = {1, 2, 3, 4, 6, 8}


U – ( AB)’ = {5, 9}


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